<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" v-on:click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>


      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false"
        show-index border>
        <template v-slot:isok="scope">
          <i class="el-icon-error" v-if="scope.row.cat_deleted===false" style="color: red;"></i>
          <i class="el-icon-success" v-else style="color: lightgreen"></i>
        </template>
        <template v-slot:order="scope">
          <el-tag size="mini" v-if="scope.row.cat_Level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_Level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <template v-slot:operator>
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>

      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum" :page-sizes="[3, 5, 10, 15]" :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <el-form :model="addCateFrom" :rules="addCateFromRules" ref="addCateFromRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateFrom.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader v-model="selectedKeys" :options="parentCateList" :props="{ expandTrigger:'hover',value:'cat_Id',label:'cat_Name',children:'children'}" expand-trigger="hover"
            @change="parentCateChanged" clearable change-on-select></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible=false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
  import axios from 'axios'
  export default {
    data() {
      return {
        catelist: [],
        querInfo: {
          type: 3,
          pagenum: 1,
          pagesize: 5
        },
        total: 0,
        columns: [{
          label: '分类名称',
          prop: 'cat_Name'
        }, {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        }, {
          label: '排序',
          type: 'template',
          template: 'order'
        }, {
          label: '操作',
          type: 'template',
          template: 'operator'
        }],
        addCateDialogVisible: false,
        addCateFrom: {
          cat_name: '',
          cat_pid: 0,
          cat_level: 0
        },
        addCateFromRules: {
          cat_name: [{
            required: true,
            message: '请输入分类名称'
          }]
        },
        parentCateList:[],
        selectedKeys: [],
        cateProps: {
          value: 'cat_id',
          lable: 'cat_name',
          children: 'children'
        }

      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await this.$http.get('https://localhost:44331/api/Commodity', {
          params: this.querInfo
        })
        if (res.status !== 200) {
          return this.$message.error('获取数据失败')
        }
        this.catelist = res.data.data
        this.total = res.data.count
      },
      handleSizeChange(newSize) {
        this.querInfo.pagesize = newSize
        this.getCateList()
      },
      handleCurrentChange(newPageNum) {
        this.querInfo.pagenum = newPageNum
        this.getCateList()
      },
      showAddCateDialog() {
        this.getParentCateList()
        this.addCateDialogVisible = true
      },
      getParentCateList() {
        axios({
          method:'get',
          url:'https://localhost:44331/api/Commodity',
          params:{type:2}
        }).then(res=>{
          if(res.status!=200){return this.$message.error('获取数据失败')}
          this.parentCateList=this.getTreeData(res.data.data.data)
        })
      },
      parentCateChanged() {
        if (this.selectedKeys.length > 0) {
          this.addCateFrom.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
          this.addCateFrom.cat_level = this.selectedKeys.length
          return
        } else {
          this.addCateFrom.cat_level = 0
          this.addCateFrom.cat_level = 0
        }
      },
      addCate() {
        this.$refs.addCateFromRef.validate(async valid => {
          if (!valid) return
          const {
            data: res
          } = await this.$http.post('https://localhost:44331/api/Commodity', this.addCateFrom)
          if (res.status !== 200) {
            return this.$message.error('添加失败')
          }
          this.$message.success('添加分类成功')
          this.getCateList()
          this.addCateDialogVisible = false
        })
      },
      addCateDialogClosed() {
        this.$refs.addCateFromRef.resetFields()
        this.selectedKeys = []
        this.addCateFrom.cat_level = 0,
          this.addCateFrom.cat_pid = 0
      },
      getTreeData(data) {
                      // 循环遍历json数据
                      for (var i = 0; i < data.length; i++) {

                          if (data[i].children.length < 1) {
                              // children若为空数组，则将children设为undefined
                              data[i].children = undefined;
                          } else {
                              // children若不为空数组，则继续 递归调用 本方法
                              this.getTreeData(data[i].children);
                          }
                      }
                      return data;
                  }

    }
  }
</script>

<style lang="less" scoped>
  .treeTable {
    margin-top: 15px;
  }

  .el-cascader {
    width: 100%;
  }
</style>
